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Sciences in Cold and Arid Regions ›› 2019, Vol. 11 ›› Issue (1): 21-28.doi: 10.3724/SP.J.1226.2019.00021

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The analysis of heat and water fluxes in frozen silty soil

DaHu Rui1,2,*(),Ming Lu1,Kunio Watanabe3,Jun Zhang2,4   

  1. 1. School of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China
    2. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
    3. Graduate School of Bioresources, Mie University. Mie 514-8507, Japan
    4. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-09-16 Accepted:2018-10-09 Online:2019-02-01 Published:2019-03-22
  • Contact: DaHu Rui E-mail:dhrui@hpu.edu.cn
  • About author:DaHu Rui, School of Civil Engineering, Henan Polytechnic University, Century Road, No. 2001, Shanyang District, Jiaozuo, Henan 454000, China. E-mail:dhrui@hpu.edu.cn

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Abstract:

In this paper, based on the basic equations of water flow and heat transfer, the hydrothermal coupling model is established. The numerical model was realized in COMSOL Multiphysics software, and simulation results are compared with the experimental results of Watanabe and Wake (2008) to verify the effectiveness of the model. Through the calculation, we can obtain the dynamic changes of heat and water fluxes, thermal and hydrological properties, matric potential and temperature gradient in unsaturated freezing soil; and these variables are unmeasurable in practice.

Key words: unsaturated freezing soil, hydrothermal coupling, heat and water fluxes, COMSOL

Figure 1

Plots (a) and (b) indicate the experimental results (Watanabe and Wake, 2008) and simulation results of the distribution of the temperature profile, respectively"

Figure 2

Plots (a) and (b) indicate the experimental results and simulation results of the distribution of the liquid-water content and total-water content in the unidirectional freezing experiment, respectively"

Figure 3

Profile of the temperature gradient at different times"

Figure 4

Curves of temperature vs. time at different depths"

Figure 5

Distribution of ice content and thermal conductivity during soil freezing"

Figure 6

Distribution of the volumetric apparent heat capacity vs. time at different depths"

Figure 7

Distribution of the heat flux at different times"

Figure 8

Distribution of the pressure head at different times"

Figure 9

(a) Distribution of the water flux at different times and (b) distribution of the water flux vs. time at different depths"

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